:root {
    --primary: #0ea5e9;
    --primary-dark: #0284c7;
    --secondary: #64748b;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --border: #475569;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --code-bg: #1a1a2e;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--background);
    color: var(--text);
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 600;
}

.logo-icon {
    font-size: 1.5rem;
}

.header-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--surface-light);
    border-radius: 0.375rem;
    font-size: 0.875rem;
}

.user-avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
}

/* Layout */
.container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.sidebar {
    width: 320px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    padding: 1.5rem;
    overflow-y: auto;
}

.right-sidebar {
    width: 280px;
    background: var(--surface);
    border-left: 1px solid var(--border);
    padding: 1.5rem;
    overflow-y: auto;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Auth Screen */
.auth-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--background);
}

.auth-container {
    text-align: center;
    max-width: 400px;
    padding: 2rem;
}

.auth-logo {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.auth-title {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.auth-subtitle {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.5rem;
    background: var(--surface-light);
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    color: var(--text);
    font-size: 0.875rem;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--surface-light);
    color: var(--text);
}

.btn-secondary:hover {
    background: var(--border);
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-success:hover {
    background: #16a34a;
}

.btn-danger {
    background: var(--error);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

.btn-small {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
}

/* Connection List */
.connection-list {
    margin-bottom: 1rem;
}

.connection-item {
    background: var(--surface-light);
    padding: 0.75rem;
    border-radius: 0.375rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
}

.connection-item:hover {
    background: var(--border);
}

.connection-item.active {
    border-color: var(--primary);
    background: rgba(14, 165, 233, 0.1);
}

.connection-name {
    font-weight: 500;
    margin-bottom: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.connection-details {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.connection-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

/* Editor */
.editor-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    border-bottom: 1px solid var(--border);
}

.editor-toolbar {
    background: var(--surface);
    padding: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid var(--border);
}

#sqlEditor {
    flex: 1;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
}

.CodeMirror {
    height: 100%;
    background: var(--code-bg);
    font-size: 14px;
}

/* Results */
.results-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.results-header {
    background: var(--surface);
    padding: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
}

.results-tabs {
    display: flex;
    gap: 0.5rem;
}

.tab-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.tab-btn.active {
    color: var(--text);
    border-bottom-color: var(--primary);
}

.results-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.row-count {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.tab-content {
    flex: 1;
    overflow: auto;
    padding: 1rem;
}

.results-table {
    width: 100%;
    overflow: auto;
}

.results-table table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.results-table th {
    background: var(--surface);
    padding: 0.5rem;
    text-align: left;
    border: 1px solid var(--border);
    font-weight: 500;
    position: sticky;
    top: 0;
}

.results-table td {
    padding: 0.5rem;
    border: 1px solid var(--border);
}

.results-table tr:hover {
    background: var(--surface);
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
}

.empty-state .hint {
    font-size: 0.875rem;
    margin-top: 0.5rem;
    font-family: monospace;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.stat-card {
    background: var(--surface);
    padding: 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 600;
}

/* Query Library */
.query-card {
    background: var(--surface-light);
    padding: 0.75rem;
    border-radius: 0.375rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
}

.query-card:hover {
    background: var(--border);
}

.query-title {
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.query-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.query-history {
    max-height: 300px;
    overflow-y: auto;
}

.history-item {
    padding: 0.5rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.75rem;
    cursor: pointer;
}

.history-item:hover {
    background: var(--surface-light);
}

.history-time {
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.history-query {
    font-family: monospace;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Status Messages */
.status-message {
    margin-top: 0.5rem;
    padding: 0.5rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
}

.status-success {
    background: rgba(34, 197, 94, 0.1);
    color: var(--success);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.status-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.query-status {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--surface);
    border-radius: 0.5rem;
    padding: 1.5rem;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    border: 1px solid var(--border);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    color: var(--text);
}

.modal-body {
    margin-bottom: 1rem;
}

.modal-footer {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
}

/* Footer */
footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 0.5rem 1.5rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 1200px) {
    .right-sidebar {
        display: none;
    }
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }
}